| 摘要 |
<p>A Furniture Unit to sit-on that comprises a frame, a seat, and a backrest where the seat is secured to the frame or to the base of the backrest frame using a ball joint, whereas the backrest frame is adjustable and equipped with at least one rest element wherein the bearing of the ball joint (A1) is secured to the seat (1), and the ball of the ball joint (A2) is secured to the main frame (2) or to the base of the backrest frame (3); the diameter of the ball joint (A) is smaller than 15 cm.</p> |
